Single tracking on portions of Red and Green lines.

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Metro riders should be aware of track work being conducted on the Orange, Red and Green lines that will affect travel this weekend.

The track work will start at 10 p.m. on Friday and will last until closing on Sunday, said Metro. Notable changes include buses replacing trains between the West Falls Church and East Falls Church stations, and single tracking on portions of the Green and Red lines.

Metro says the construction is part of a six-year $5 billion Capital Improvement Program to bring the Metro system into a state of good repair. Projects include replacing escalators, modernizing 12 stations, replacing 100 Metrobuses and retrofitting tracks.

Metro has provided these changes for the weekend:

Orange Line trains will run between Vienna and West Falls Church station every 20 minutes and between East Falls Church and New Carrollton station at normal weekend intervals. Buses will replace trains between the East Falls Church and West Falls Church stations.

Red Line trains will single track between Takoma and Forest Glen, and between Van Ness and Friendship Heights. Red Line trains between Shady Grove and Glenmont will operate every 24 minutes throughout the weekend. Between 9 a.m. and 9 p.m. on Saturday and Sunday, additional trains will operate between Van Ness and New York Avenue only, providing service every 12 minutes.

Green Line trains will single track between Greenbelt and Prince George's Plaza stations. Green Line trains will operate every 16 minutes throughout the weekend. Yellow Line trains will operate between Huntington and Mount Vernon Square only. Customers traveling to/from stations north of Mount Vernon Square should use Green Line trains to complete their trip.